Counterfeit medicines in Peru, is a serious public health problem; interventions to legal and illegal trades made by the General Directorate of Medicines, Supplies and Drugs (DIGEMID) and the Multisectoral Technical Group on Preventing and Combating Smuggling and Illegal Trade in Counterfeit Pharmaceutical and Allied (CONTRAFALME), indicate the need for information that should have the population about counterfeit drugs. This study aims to determine the level of knowledge about counterfeit drugs in third secondary school students from the School Juana Alarco de Dammert-Miraflores, to achieve this the scale of Estaninos was used. To determine the effectiveness of the training a comparison parametric test with paired averages was used. An active methodological strategy was used in the training design to achieve meaningful learning. The research is quantitative with a pre-experimental design, the sample consisted of 51 female students from 13 to 17 years old, selected through a non-probability causal sampling. The study was made in December 2014. Before applying training, the knowledge level about counterfeit drugs was "medium” 51,0% and "high" 19,6% varying to 7,8% and 92,2% respectively after applying training. The pre-training average was 13,81 and post-training was 17,84, where you can see a positive change with a difference of 4,03 points, equivalent to an overall increase of 29%. With 95% confidence, we affirm that the post-training average is between 17,40 and 18,27. It was determined, that the level of knowledge of the participants at the beginning was "medium" and at the final, it was "high".
Keywords: Counterfeit medicine, active methodology, training, knowledge level.